Scrapy 1.2.1 发布，web 爬虫框架

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                            　　Scrapy 1.2.1 发布了。
　　Scrapy 是一套基于基于Twisted的异步处理框架，纯python实现的爬虫框架，用户只需要定制开发几个模块就可以轻松的实现一个爬虫，用来抓取网页内容以及各种图片。
　　更新内容：
　　新功能

• 　　New FEED_EXPORT_ENCODING setting to customize the encoding used when writing items to a file. This can be used to turn off \uXXXX escapes in JSON output. This is also useful for those wanting something else than UTF-8 for XML or CSV output (#2034).
  
• 　　startproject command now supports an optional destination directory to override the default one based on the project name (#2005).
  
• 　　New SCHEDULER_DEBUG setting to log requests serialization failures (#1610).
  
• 　　JSON encoder now supports serialization of set instances (#2058).
  
• 　　Interpret application/json-amazonui-streaming as TextResponse (#1503).
  
• 　　scrapy is imported by default when using shell tools (shell, inspect_response) (#2248).
  

　　Bug 修复

• 　　DefaultRequestHeaders middleware now runs before UserAgent middleware (#2088). Warning: this is technically backwards incompatible, though we consider this a bug fix.
  
• 　　HTTP cache extension and plugins that use the .scrapy data directory now work outside projects (#1581). Warning: this is technically backwards incompatible, though we consider this a bug fix.
  
• 　　Selector does not allow passing both response and text anymore (#2153).
  
• 　　Fixed logging of wrong callback name with scrapy parse (#2169).
  
• 　　Fix for an odd gzip decompression bug (#1606).
  
• 　　Fix for selected callbacks when using CrawlSpider with scrapy parse (#2225).
  
• 　　Fix for invalid JSON and XML files when spider yields no items (#872).
  
• 　　Implement flush() for StreamLogger avoiding a warning in logs (#2125).
  

　　重构

• 　　canonicalize_url has been moved to w3lib.url (#2168).
  

　　下载地址：

• 　　Source code (zip)
  
• 　　Source code (tar.gz)